Spark-plug attachment



Feb. 10. 1925. 1.525539 J. G. GAVLAK SPARK PLUG ATTACHMENT Filed Dec.16, 1920 Wimsss INVENTOK $9M? w & 45M

Patented Feb. 10, 1925.

UNITED STATES.

PATENT OFFICE.

SPARK-PLUG n'r'rncniunnr.

Application field DecemberlG, 1 920. serial No. 431,297.

To all whom it may concern:

Be it known that I, J OSEPH G. GAVIAK, a citizen of the United States,residing at Monongahela City, in the county of Allegheny and StateofPennsylvania, have invented certain new and useful Improvements inSpark-Plug Attachments, of which the following is a specification.

This invention relates to improvements in spark plugs, and the primaryobject thereof isto provide a device of the class stated, in a manner ashereinafter set forth, whereby the intensity of the spark employed forigniting the combustible mixture within the combustion chamber of theengine will be intensified or increased, under such conditions reducingthe possibility of miss-fire to a minimum, whereby the efl iciency ofthe engine will be increased.

Further objects of the invention are to provide a device of thecharacter described which is simple in its construction andarrangement,strong, durable and eificient in its use, positive in itsaction, which provides visible means for ascertaining its functioning,andwhich is comparatively inexpensive to manufacture.

To the accomplishment of these and such other objects as may hereinafterappear the invention consists of the novel construction, combination andarrangement of parts herein specifically described and illustrated inthe accompanying drawing wherein is shown an embodiment of theinvention, but it is to be understood that changes, variation andmodification can be resorted to which come within the scope of the claimhereunto appended. V 1 p In the drawing forming a portion of thisspecification and wherein like numerals of reference designatecorresponding parts throughout the several views:

Figure 1 is a vertical elevation ofa spark plug in accordance with theinvention.

Figure 2 is avertical sectional view there of.

Figure 3 is a top plan view of the device, and Figure 4 a bottom View.

Referring in detail to the drawing 1 indica-tes a metal bushing or shellformed with an externally screw-threaded inner end 2 adapted to bescrewed in anengine cylinder by means of a hexagonal head 3 on its outerend. The shell 1 is formed with an axial bore in which the porcelainplug 4 is secure ly mounted by means of the ring nut 5.

Awvire 6 extends centrally through the plug 4 and forms one of theelectrodes of the device. The other electrode 7, instead of beingattached to the inner face of the shell 1 in the usual manner, iscarried by having a portion thereof embedded in the lower portion of theplug 4. The upper end of the embedded portion of the electrode 7protrudes, as at 8, through the side of the plug 4 and is in contactwith the inner face of the ring nut 5. This arrangement of the electrode7 obviates the necessity of drilling the inner face of the shell 1 andmounting the electrode thereon, thereby providing for the economicalassembly of the device.

An electrode support 9, having its lower and formed to provide aclamping element 10, is securely clamped to the outer end of the plug 4.An electrode 11, positioned to extend in alinement with the electrode 6,is adjustably mounted in the aperture 12 formed in the support 9. Theelectrode 11' is threaded throughout its length and is secured in theadjusted position by means of the nut 13 and the washer 17 on the outerface of the support 9, and the nut 15 and the washer 14 on the innerface of the support. Positioned in the aperture 12, of the support 9, isthe washer 17, which is of fibre and extends on the outer face of thesaid support 9, and through said washer 17 extends the electrode 11, thelatter also extends through a fibre washer 14. The nut 13 bears againstthe washer 17 and the nut 15 abuts against the washer 14. The washers 14and 17 insulate the electrode from the support 9. For securing theconductor terminal 18 to the electrode 11, a spring 19 is provided,having one end thereof attached, as at 20, to the support 9. The freeend of the spring 19 isformed with an aperture 21 in which a fibrebushing 22 provided with a flange 23 is fixedly .mounted. The flangedportion of the bushing 22 engages the terminal 18 and the action of thespring 19 will hold the latter in constant contact with the electrode 11and nut 13, and permit of its ready removal if desired.

7 The opposed ends of the electrodes 11 and 6 are spaced slightly fromeach other to pro- 1 ped 9 tti e 26 o e leetre l 7 nd is es wit we s? e.fi e Spring the letter'i'wi t h' the' tapered ir'm'e riend of haiiirgJewel end the electrode 11. the free end of send sprlng formed Wlth anWhat I eleim is: epeetere fee the passage of said electrode 5 I an tt hmt e igp -l;-pe eh ene everleppengeed e eteng teexert e. fee 15combination of asupport having its lower. eq zpga nsft said Contact nut,substantially d f d t id a clamp aflfipfd f aSHes'cfibfi and for thepurpose set forth. be secured to the outer end ,qf the-gapreelain I ltesme y l l ei I affix y slgnatureplug of the spark plug, an electrode ad-10 justably-mounted-in vsaid support and prpo- JQSEPH G-GAVLAK.

